const std = @import("std");
const log = std.log.scoped(.main);
const mem = std.mem;
const process = std.process;

const vaxis = @import("vaxis");
const View = vaxis.widgets.View;
const Cell = vaxis.Cell;
const border = vaxis.widgets.border;

const Event = union(enum) {
    key_press: vaxis.Key,
    winsize: vaxis.Winsize,
};

pub fn main() !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    defer {
        const deinit_status = gpa.deinit();
        if (deinit_status == .leak) {
            log.err("memory leak", .{});
        }
    }
    const alloc = gpa.allocator();

    var world_map: []const u8 = lg_world_map;
    var map_width = lg_map_width;
    var map_height = lg_map_height;
    var use_sm_map = false;
    var use_mini_view = false;

    var x: usize = 0;
    var y: usize = 0;
    var h: usize = 0;
    var w: usize = 0;
    defer log.info(
        \\Results:
        \\ - Map Size:    {d}x{d}
        \\ - Screen Size: {d}x{d}
        \\ - Position:    {d}, {d}
    , .{
        map_width, map_height,
        w,         h,
        x,         y,
    });

    var tty = try vaxis.Tty.init();
    defer tty.deinit();

    var buffered_writer = tty.bufferedWriter();
    const writer = buffered_writer.writer().any();

    // Initialize Vaxis
    var vx = try vaxis.init(alloc, .{
        .kitty_keyboard_flags = .{ .report_events = true },
    });
    defer vx.deinit(alloc, tty.anyWriter());
    var loop: vaxis.Loop(Event) = .{
        .vaxis = &vx,
        .tty = &tty,
    };
    try loop.init();
    try loop.start();
    defer loop.stop();
    try vx.enterAltScreen(writer);
    try buffered_writer.flush();
    try vx.queryTerminal(tty.anyWriter(), 20 * std.time.ns_per_s);

    // Initialize Views
    // - Large Map
    var lg_map_view = try View.init(alloc, &vx.unicode, .{ .width = lg_map_width, .height = lg_map_height });
    defer lg_map_view.deinit();
    //w = lg_map_view.screen.width;
    //h = lg_map_view.screen.height;
    var lg_map_buf: [lg_map_width * lg_map_height]u8 = undefined;
    _ = mem.replace(u8, lg_world_map, "\n", "", lg_map_buf[0..]);
    _ = try lg_map_view.printSegment(.{ .text = lg_map_buf[0..] }, .{ .wrap = .grapheme });
    // - Small Map
    var sm_map_view = try View.init(alloc, &vx.unicode, .{ .width = sm_map_width, .height = sm_map_height });
    defer sm_map_view.deinit();
    w = sm_map_view.screen.width;
    h = sm_map_view.screen.height;
    var sm_map_buf: [sm_map_width * sm_map_height]u8 = undefined;
    _ = mem.replace(u8, sm_world_map, "\n", "", sm_map_buf[0..]);
    _ = try sm_map_view.printSegment(.{ .text = sm_map_buf[0..] }, .{ .wrap = .grapheme });
    // - Active Map
    var map_view = lg_map_view;

    // TUI Loop
    while (true) {
        const event = loop.nextEvent();
        switch (event) {
            .key_press => |key| {
                // Close Demo
                if (key.matches('c', .{ .ctrl = true })) break;
                // Scroll
                if (key.matches(vaxis.Key.left, .{})) x -|= 1;
                if (key.matches(vaxis.Key.right, .{})) x +|= 1;
                if (key.matches(vaxis.Key.up, .{})) y -|= 1;
                if (key.matches(vaxis.Key.down, .{})) y +|= 1;
                // Quick Scroll
                if (key.matches(vaxis.Key.left, .{ .ctrl = true })) x -|= 30;
                if (key.matches(vaxis.Key.right, .{ .ctrl = true })) x +|= 30;
                if (key.matches(vaxis.Key.up, .{ .ctrl = true })) y -|= 10;
                if (key.matches(vaxis.Key.down, .{ .ctrl = true })) y +|= 10;
                // Goto Side
                if (key.matches(vaxis.Key.left, .{ .shift = true })) x -|= map_width;
                if (key.matches(vaxis.Key.right, .{ .shift = true })) x +|= map_width;
                if (key.matches(vaxis.Key.up, .{ .shift = true })) y -|= map_height;
                if (key.matches(vaxis.Key.down, .{ .shift = true })) y +|= map_height;
                // Change Zoom (Swap Map Views)
                if (key.matches('z', .{})) {
                    if (use_sm_map) {
                        world_map = lg_world_map;
                        map_width = lg_map_width;
                        map_height = lg_map_height;
                        map_view = lg_map_view;
                    } else {
                        world_map = sm_world_map;
                        map_width = sm_map_width;
                        map_height = sm_map_height;
                        map_view = sm_map_view;
                    }
                    use_sm_map = !use_sm_map;
                    w = map_width;
                    h = map_height;
                }
                // Mini View (Forced Width & Height Limits)
                if (key.matches('m', .{})) use_mini_view = !use_mini_view;
            },
            .winsize => |ws| try vx.resize(alloc, tty.anyWriter(), ws),
        }

        const win = vx.window();
        win.clear();

        const controls_win = win.child(.{
            .height = .{ .limit = 1 },
        });
        _ = try controls_win.print(
            if (win.width >= 112) &.{
                .{ .text = "Controls:", .style = .{ .bold = true, .ul_style = .single } },
                .{ .text = " Exit: ctrl + c | Scroll: dpad | Quick Scroll: ctrl + dpad | Goto Side: shift + dpad | Zoom: z | Mini: m" },
            } else if (win.width >= 25) &.{
                .{ .text = "Controls:", .style = .{ .bold = true, .ul_style = .single } },
                .{ .text = " Win too small!" },
            } else &.{
                .{ .text = "" },
            },
            .{ .wrap = .none },
        );

        // Views require a Window to render to.
        const map_win = if (use_mini_view)
            win.child(.{
                .y_off = controls_win.height,
                .border = .{ .where = .top },
                .width = .{ .limit = 45 },
                .height = .{ .limit = 15 },
            })
        else
            win.child(.{
                .y_off = controls_win.height,
                .border = .{ .where = .top },
            });

        // Clamp x and y
        x = @min(x, map_width -| map_win.width);
        y = @min(y, map_height -| map_win.height);

        map_view.draw(map_win, .{
            .x_off = x,
            .y_off = y,
        });
        if (use_mini_view) {
            _ = try win.printSegment(
                .{ .text = "This is a mini portion of the View." },
                .{ .row_offset = 16, .col_offset = 5, .wrap = .word },
            );
        }

        // Render the screen
        try vx.render(writer);
        try buffered_writer.flush();
    }
}

const sm_world_map =
    \\ +NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN+
    \\ W................................................................................................E
    \\ W................................................................................................E
    \\ W............................ @:::::::::@  .....................    .............................E
    \\ W.....      .   .....   :::  ...::::::: ........   ......  %@%...........:*%@    . ..............E
    \\ W..@::::::::::::::::::::  :::  ::::@  @@ ..... %#%%%%%%%%%%%%...........................* .......E
    \\ W ::::@::::::::::::: .. ::  ... * .......  . %%% %%%%%%%%%%%%%..................... ..* .........E
    \\ W  .....@::::::::::::.=::::: ........... @%  @. %%      %%%-...................:%%  @. ..........E
    \\ W...... :::%@@:@:::::::::@ :-...........  @%%%%%%%%%%%%%%%%........................ .. ..........E
    \\ W......@::::@@@.=-:::::=:  ............. %@%%@# %%%%%%%..%%%.........@............ @=............E
    \\ W..... :::::::::::::: ................. %%%    @ % ...........................  . . .............E
    \\ W..... #:::::::::::@ .................. @=====@       .........................@  .= ............E
    \\ W...... :::::@   @ ................... ============== .... ..................... .. .............E
    \\ W....... .::=..  :# ................. ================ ......   ............... .................E
    \\ W......... ::::...  @-............... ================- ....@ ...-... . ....@ ..  ...............E
    \\ W............. :=.. %  ...............==================+   ......@. .... ... .. @ ..............E
    \\ W...............  ######@ ............ ========@=@@@======@........ @.... .  ..  ................E
    \\ W................ ######### ................. ===========@............... .@  ..@ =..............E
    \\ W............... #############= ............. ========== ................. .  ..*. . ---  .......E
    \\ W................ ###@@@#@#####%.............. ======== .................... @.@.... .*-=- ......E
    \\ W................. ##@##@@#@### .............. ========-. -......................   -- + ........E
    \\ W................... ##########................=======% *= .................... @-------- .......E
    \\ W................... #######*  ................-====== .-+....................#-@--@-@#--- ......E
    \\ W................... ####### .................. ====- ........................@----------- ......E
    \\ W................... ###### ....................@-* .......................... =    ----:.....  .E
    \\ W....................####@ ......................................................... -  ....  -@ E
    \\ W.................... ###.................................................................%-@ ...E
    \\ W..................... #@........................................................................E
    \\ W......................    ......................................................................E
    \\ +SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS+
    \\
;
const sm_map_width = mapWidth: {
    @setEvalBranchQuota(100_000);
    break :mapWidth mem.indexOfScalar(u8, sm_world_map, '\n').?;
};
const sm_map_height = mapHeight: {
    @setEvalBranchQuota(100_000);
    break :mapHeight mem.count(u8, sm_world_map, "\n");
};

const lg_world_map =
    \\  +NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN+ 
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;
const lg_map_width = mapWidth: {
    @setEvalBranchQuota(100_000);
    break :mapWidth mem.indexOfScalar(u8, lg_world_map, '\n').?;
};
const lg_map_height = mapHeight: {
    @setEvalBranchQuota(100_000);
    break :mapHeight mem.count(u8, lg_world_map, "\n");
};